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Linear Technology Electronic Components Datasheet

LTC3608 Datasheet

8A Monolithic Synchronous Step-Down DC/DC Converter

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FEATURES
n 8A Output Current
n Wide VIN Range = 4V to 18V
n Internal N-Channel MOSFETs
n True Current Mode Control
n Optimized for High Step-Down Ratios
n tON(MIN) ≤ 100nsec
n Extremely Fast Transient Response
n Stable with Ceramic COUT
n ±1% 0.6V Voltage Reference
n Power Good Output Voltage Monitor
n Adjustable On-Time/Switching Frequency
n Adjustable Current Limit
n Programmable Soft-Start
n Output Overvoltage Protection
n Optional Short-Circuit Shutdown Timer
n Low Shutdown IQ: 15μA
n Available in a 7mm × 8mm 52-Lead QFN Package
APPLICATIONS
n Point of Load Regulation
n Distributed Power Systems
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents including
5481178, 6100678, 6580258, 5847554, 6304066.
LTC3608
18V, 8A Monolithic
Synchronous Step-Down
DC/DC Converter
DESCRIPTION
The LTC®3608 is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 8A output
current from a 4V to 18V (20V maximum) input supply. It
uses a valley current control architecture to deliver very
low duty cycle operation at high frequency with excellent
transient response. The operating frequency is selected
by an external resistor and is compensated for variations
in VIN and VOUT.
The LTC3608 can be configured for discontinuous or
forced continuous operation at light load. Forced continu-
ous operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal foldback current
limiting, an output overvoltage comparator and an optional
short-circuit shutdown timer. Soft-start capability for sup-
ply sequencing is accomplished using an external timing
capacitor. The regulator current limit is user programmable.
A power good output voltage monitor indicates when
the output is in regulation. The LTC3608 is available in a
compact 7mm × 8mm QFN package.
TYPICAL APPLICATION
High Efficiency Step-Down Converter
0.1μF VOUT
100pF
1500pF
11.3k
VON
RUN/SS
ION
VIN
LTC3608
SW
ITH BOOST
SGND INTVCC
FCB
VRNG
PGOOD PGND
EXTVCC VFB
3608 TA01a
187k
0.8μH
0.22μF
10μF
×3
VIN
4V TO 18V
100μF
×2
VOUT
2.5V
8A
4.7μF
30.1k
9.53k
Efficiency and Power Loss
vs Load Current
100
95
90
85
80
75
70
65
60
55
50
0.01
EFFICIENCY
10000
1000
POWER LOSS
100
10
VIN = 12V
VOUT = 2.5V
EXTVCC = 5V
1
0.1 1 10
LOAD CURRENT (A)
3608 TA01b
3608fa
1


Linear Technology Electronic Components Datasheet

LTC3608 Datasheet

8A Monolithic Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3608www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (SVIN, PVIN, ION)....... 20V to –0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................ 26V to –0.3V
SW Voltage ............................................... 20V to –5V
INTVCC, EXTVCC, (BOOST – SW), RUN/SS,
PGOOD Voltages...................................... 7V to –0.3V
FCB, VON, VRNG Voltages............ INTVCC + 0.3V to –0.3V
ITH, VFB Voltages ....................................... 2.7V to –0.3V
Operating Junction Temperature Range
(Notes 2, 4)........................................ –40°C to 125°C
Storage Temperature Range................... –55°C to 125°C
PIN CONFIGURATION
TOP VIEW
PVIN 1
PVIN 2
PVIN 3
PVIN 4
PVIN 5
PVIN 6
PVIN 7
SW 8
NC 9
SGND 10
BOOST 11
RUN/SS 12
VON 13
SGND 14
53
PVIN
55
SW
54
SGND
40 PGND
39 PGND
38 PGND
37 PGND
36 PGND
35 PGND
34 PGND
33 SW
32 INTVCC
31 INTVCC
30 SVIN
29 EXTVCC
28 NC
27 SGND
WKG PACKAGE
52-LEAD (7mm × 8mm) QFN MULTIPAD
TJMAX = 125°C, θJA = 29°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3608EWKG#PBF
LTC3608EWKG#TRPBF LTC3608WKG
52-Lead (7mm × 8mm) Plastic QFN
–40°C to 125°C
LTC3608IWKG#PBF
LTC3608IWKG#TRPBF LTC3608WKG
52-Lead (7mm × 8mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3608fa
2


Part Number LTC3608
Description 8A Monolithic Synchronous Step-Down DC/DC Converter
Maker Linear Technology
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LTC3608 Datasheet PDF





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